Code No.U1504 RLS LIN timeout/Not equipped
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Before replacing the ECU, ensure that the communication circuit is normal.
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JUDGEMENT CRITERIA
The ETACS-ECU will set diagnosis code No. U1504 when no signals are received from the lighting control sensor.
PROBABLE CAUSES
- Faulty lighting control sensor
- Malfunction of the LIN bus
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STEP 1. Resistance measurement at the lighting control sensor connector
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between the lighting control sensor connector (earth terminal) and the body earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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 Go to Step 3.
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 Go to Step 2.
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STEP 2. Check of open circuit in earth line between lighting control sensor connector and body earth
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction  ).
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Repair the connector(s) or wiring harness.
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STEP 3. Voltage measurement at the lighting control sensor connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the voltage between the lighting control sensor connector (power supply terminal) and the body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 4.
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STEP 4. Check of short to power supply, and open circuit in power supply line between lighting control sensor connector and junction block connector.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
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Repair the connector(s) or wiring harness.
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STEP 5. Check of open circuit in LIN line between ETACS-ECU connector and lighting control sensor connector.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the connector(s) or wiring harness.
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STEP 6. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set in the ETACS-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the lighting control sensor (Refer to GROUP 51 - Lighting Control Sensor ).
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A poor connection, open circuit, or other intermittent malfunctions in the LIN bus lines between the lighting control sensor and the ETACS-ECU (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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